We have some of the P216s on sweepers and never had a problem. I'll take a look when I go into work and see what I can find in our parts book. Most of the time the dipsticks tubes are interchangable unless they redesigned the hole. If the hole is threaded you could possible make you own tube and dipstick cap, the hole if threaded should be standard pipe thread.

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Clay Walsten
ET III
Developed Regional Parks
City of San Diego